What is iOS?

Apple Inc. developed the multiplatform operating system known as iOS (iPhone Operating System) specifically for the iPhone. The platform has previously supported the company’s iPad (until 2019) and iPod Touch (until 2022) devices. The program is based on Mac OS X (macOS after 2016), the operating system for Apple machines since 2001. The watchOS, tvOS, and iPadOS operating systems—which support the Apple Watch, Apple TV, and iPad, respectively—were derived from iOS. iOS became the second most popular mobile operating system globally in 2023. Enroll in our mobile app development training in Chennai at SLA Jobs.

Overview of iOS

Apple iOS, the operating system for the iPhone, iPad, and other Apple mobile devices is based on macOS. This operating system powers Apple’s Mac desktop and laptop products. It is also designed to facilitate seamless networking across a variety of Apple products. 

In a nutshell, iOS is a mobile operating system designed exclusively for Apple Inc. hardware. The operating system is what makes mobile devices from different manufacturers, like the iPhone, stronger. Explore the top 10 frameworks in Python and upgrade your skills.

Features of iOS

iOS has many features. The following are some of iOS’s primary features:

  • The iPhone operating system supports multitasking. With the iPhone 4 and iPhone 3GS, it all began. Using the multitasking feature on an iOS device or a multi-finger gesture on an iPad, you can quickly switch between apps.
  • Apple provides an online mapping service that iOS devices can use as their default map system. Among the things it provides is a flypast mode. You can create map-based applications with Apple’s MapKit.
  • Cloud-based data storage is provided via Apple’s iCloud service. It runs in the background for the most part, is compatible with Windows to some extent, and functions on all Apple devices. It’s quite safe. To make sure that the user’s data is not lost, it has a backup feature.
  • A gyroscope is a tool used to gauge how quickly an object rotates around a spatial axis. A three-axis gyroscope that provides rotation data on all three axes is a feature of many iOS devices.
  • In addition, Apple offers classes for connecting to Bluetooth-enabled low-energy wireless technology and the Core Bluetooth foundation. 

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What is an iPhone Application?

The iPhone app is a piece of software designed specifically for usage on Apple’s iOS-powered iPhone handsets. These applications, which are designed to run on Apple’s iOS mobile operating system, can be found on the App Store. 

Apple encourages programmers to create iPhone applications that may be downloaded through the App Store. In addition, the company has made available an SDK in addition to the example code projects to help developers get started. Reshape your career by upskilling with one of our top 10 software courses.

What is iOS App Development?

iOS app development is the process of creating mobile applications for Apple devices, such as the iPad, iPhone, and iPod Touch. The program is published on the App Store for consumers to download after being written in either Swift or Objective-C. 

Developers utilize the iOS software development kit (SDK) to create apps for Apple mobile devices. Interfaces and tools for building, installing, running, and testing the apps are included in the SDK. The Objective-C programming language and the iOS system frameworks are used to create native apps. An app must pass a quality review process before it can be released on the App Store. 

How does iOS App Work?

Applications on iOS are event-driven. The UIButton-like object/control is capable of listening to certain events, such as touches and taps. When an event is triggered, the object calls the predetermined action associated with the event. Learn the Unix Course in Chennai at SLA.

iOS is an OS that resembles Unix and is adapted from Mac OS X. Within iOS, there are four layers of abstraction:

Core OS Layer: Offers low-level functionality together with security and hardware-interaction frameworks.

Core Services Layer: Offers services that higher layers need.

Media Layer: Offers the audio, video, and graphic technologies that are required.

The Coca Touch Layer is home to the frameworks that are frequently used while developing an application. Many default apps are included with iOS, including an email client, a web browser called Safari, an iPod player, and a phone app.

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Release History of iOS

iPhone OS was the initial name of Apple iOS. Before iOS 4 appeared in June 2010, the business published three iterations of the mobile operating system under that designation. On July 11, 2008, Apple announced iOS 2. It made its debut in tandem with Apple’s iPhone 3G. 

On June 17, 2009, iOS 3 was released as the next operating system. The iPhone 4 and the fourth version of iOS were released on June 21, 2010.

With the release of iOS 5, on October 12, 2011, Apple increased the total number of applications available to over 500,000. Along with other additions, this iOS version brought Siri, a camera app, and a ‘Notification Center’.

iOS 6, which was released on June 11, 2012, came with two apps: Maps and Passbook, which is an application for storing tickets and a reward program.

When iOS 7 was released on September 18, 2013, it had a completely new user interface. Continuity, a cross-platform feature that lets users of many Apple devices pick up where they left off from one, was launched with iOS 8 in September 2014. Apple Music and the Photos app were among the other new features.

Released on September 16, 2015, and September 13, 2016, respectively, Apple iOS 9 and iOS 10 included enhancements including a redesigned notifications section, enhanced iMessage capabilities, and Siri integration with third-party apps.

On September 19, 2017, iOS 11 was released. with the eighth and eighth-plus iPhone models. Apple stopped supporting older 32-bit iPhones with this version. On September 17, 2017, the firm unveiled iOS 12, along with the new iPhone XS and iPhone XS Max. Explore the different career opportunities in the IoT

iOS 13

Apple announced iOS 13 on September 19, 2019. The following are a few of iOS 13’s most noteworthy features:

  • Fresh light on a dark color palette is the dark mode.
  • A recently released Maps application with features similar to street view.
  • An improved Siri that can announce messages to AirPod users and seem more realistic.
  • Reminders were reorganized into Scheduled Tasks, Finished Tasks, Flagged Tasks, and All Tasks categories in the Reminders app.
  • A revised health app that will enable improved tracking of health data over time. The app’s functionality is to improve women’s health.

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iOS 14

The release date for iOS 14 was September 16, 2020. One of the features is a messaging software that lets users put @mentions in messages and undo mistakenly transmitted messages. With this update, third-party apps can now be used as the default for playing music, opening emails, and browsing the web. Apple also included augmented reality features in the operating system. Check out the latest Zoho salary for freshers.

iOS 15

The release date of iOS 15 was September 20, 2021. iOS 15 features include text recognition in photos, sharing screens via SharePlay on FaceTime, updating alerts, utilizing FaceID while wearing a mask, and filtering notifications and apps to minimize distractions. Even if someone does not own an Apple device, users can still invite them to participate in online FaceTime.

With the latest update to Apple Wallet, users can now upload personal identity, add multiple passes at once, and unlock doors with compatible HomeKit door locks using their house, vehicle, or workplace keys. Additionally, iOS 15 includes support for health screening and sharing with wearable technology, such as the Apple Watch. Now, users may keep an eye on their blood sugar levels, their gait stability, and variations in metrics like heart rate. Explore a wide range of trending software courses for non-IT graduates.

iOS 16

The release date of iOS 16 was September 12, 2022. Increased customization of the lock screen with the ability to add widgets (such as calendar events or the weather) and real-time activities (like gaming scores and meal delivery monitoring) are among the features of iOS 16. Learn about the highest-paying software jobs and enhance the required skills at SLA. The following are some additional significant feature additions:

  • Focus has a new setup that allows users to choose which apps and individuals to receive notifications from to reduce distractions. Additionally, users can choose to view meetings and to-do lists using the Personal Focus and Work Focus widgets.
  • Through Messages, SharePlay users can share videos, music, and TV episodes. For further collaboration, users can also share Safari tab groups, notes, presentations, and reminders via Messages.
  • With the Mail app, users may unsubscribe from schedules and check up on past emails. Users may now add links with a new search function that suggests matches as they enter.
  • Passkeys are a novel end-to-end encrypted sign-on method that improves security. Passkeys are compatible with non-Apple devices as well.
  • The Apple Wallet upgrades include Apple Pay Later, which allows you to plan payments, monitor orders, and message each other the keys to things like hotel rooms. To confirm identity, customers can also utilize it to show their IDs in other apps, including Uber Eats.

The iPhone 8 and later models are compatible with iOS 16. iPad 5th generation or later, iPad mini 5th generation or later, iPad Air 3rd generation or later, and all iPad Pro models are compatible with iPad OS 16. Learning about the TCS salary for freshers will encourage you.

What’s new in iOS 17?

Apple announced new features with the iOS 17 update on June 5, 2023. On July 12, 2023, the first public beta of iOS 17 was released. On September 18, 2023, the software update became generally available. This release’s feature upgrades improve iPhone, FaceTime, and Messages communication experiences by adding more personalization, and they also try to simplify AirDrop sharing. New features in iOS 17 include a journal for practicing thankfulness and StandBy for viewing information when the iPhone is placed down or charging. Learn about the top reasons why Java is still trending.

Other significant upgrades consist of:

Voicemail in real-time: Real-time transcription is visible to users when a voicemail is left. In addition, users will be able to answer while the caller is still leaving their message. Calls that are marked as spam won’t have this choice; they will be immediately rejected.

Messages with video and audio on FaceTime: If someone is unavailable, users may now share a message. New responses to calls include balloons, rain, hearts, and fireworks. Apple TV 4K users will be able to monitor FaceTime and see who is calling them on their TV. Either start on the iPhone and move to the Apple TV, or make calls straight from the Apple TV.

Messages: With iOS 17, users may create Live Stickers, which are stickers that can be applied to messages based on photographs. Moreover, messages will support Check-In, a new feature that enables users to securely share their location with others via end-to-end encryption.

Standby: With a new display option that shows widgets and notifications, users of iOS-powered smartphones will now enjoy a more horizontal experience. 

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Sharing via NameDrop and AirDrop: Using AirDrop will make it easier to share files or photos quickly. NameDrop will allow users to tap two iPhones or Apple Watches together to share contact information. When users are close to one another, they can utilize the same motion to share content and enjoy a movie, game, or piece of music. 

Automated Correction: A recent update to the transformer-based machine-learning language model improves word prediction and precision. There will be a change in layout to provide spelling and grammar fixes. A better speech recognition model will result in more accurate dictation.

App for health: The Health app gives users access to evaluations for anxiety and depression as well as mental health features that let them monitor their emotions and moods. Additionally, the app offers nearby resources for further details or help.

Security: Users can log into websites and online services more securely with the support for passkeys. The private browsing mode in the Safari web browser has been improved to more effectively block trackers.

The launch operating system for the iPhone 15, iOS 17, is compatible with iPhone models XR or later. If you want to learn about Android OS, explore the importance and benefits of Android.

Factors Influencing the Cost of Developing iOS Apps

Numerous variables influence the price of developing an iOS app. Before deciding on the iOS app development budget, take these into account. 

iOS App Size

The little iOS app will cost between $5,000 and $10,000 and may take one to two months to develop.

The medium-sized iOS app will cost between $10,000 and $50,000 and may take two to six months to build.

The creation of the business iOS app may take more than six months, and it would cost more than $50,000.

The size of an application affects how much it costs to build. The cost of developing an app rises along with its size, features, and functionalities. Enroll in our iOS training in Chennai and kick-start your mobile app development career.

iOS Development Team

Hiring iOS app developers could come at a comparably higher cost. However, hiring an iOS app development business would turn out to be more affordable. 


The location of development also affects how much it costs to create an iOS app. The price per hour for developing an app varies throughout nations. For instance, it ranges from $20 to $40 per hour in India to $80 to $170 per hour in the US, etc. Check out the CTS salary for freshers in mobile app development.


We believe that this post will be useful in gathering crucial information on iOS apps, starting with the most basic question: “What is an iOS app?” This software was created to function on iPhones running iOS and perform other similar queries. SLA Jobs training courses help you enhance your skills for the best mobile app development career.